Updated Readme

Author: Russell Stewart

README.txt

@@ -1 +1,104 @@
-README!
+# install
+sudo pip install pythonpy; alias py='pythonpy'
+
+# float arithmetic
+$ py '3 * 1.5'
+4.5
+
+# exponentiation
+$ py '7**3'
+343
+
+# number sequence
+$ py 'range(3)'
+0
+1
+2
+
+# list comprehensions
+$ py '[x**2 for x in range(1,5)]'
+1
+4
+9
+16
+
+# math library usage
+$ py 'math.exp(1)'
+2.71828182846
+
+# random library usage
+$ py 'random.random()'
+0.103173957713
+
+# multiply each line of input by 7.
+$ py 'range(3) | py -x 'int(x)*7'
+0
+7
+14
+
+# append ".txt" to each line of input
+$ py 'range(3)' | py -x 'x + ".txt"'
+0.txt
+1.txt
+2.txt
+
+# Sometimes you want to treat the input as a python list.
+# reverse a list
+$ py 'range(4)' | py -l 'sorted(l, reverse=True)'
+3
+2
+1
+0
+
+# sum a list of numbers
+$ py 'range(4)' | py -l 'sum(int(x) for x in l)'
+6
+
+# count the lines of input
+$ py 'range(17)' | py -l 'len(l)'
+17
+
+# Other times you just want to filter out lines from the input.
+# get only even numbers 
+$ py 'range(8)' | py -x 'x if int(x)%2 == 0 else None'
+0
+2
+4
+6
+
+# The shorthand -fx (filter on x) is also available.
+# get only odd numbers
+$ py 'range(8) | py -fx 'int(x)%2 == 1'
+1
+3
+5
+7
+
+# get words starting with "and"
+$ cat /usr/share/dict/words | py -fx 're.match(r"and", x)' | head -5
+and
+andante
+andante's
+andantes
+andiron
+
+#get verbs starting with ba
+$ cat /usr/share/dict/words | py -fx 're.match(r"ba.*ing$", x)' | head -5
+baaing
+babbling
+babying
+babysitting
+backbiting
+
+# get long palindromes
+$ cat /usr/share/dict/words | py -fx 'x==x[::-1] and len(x) >= 5' | head -5
+civic
+deified
+kayak
+level
+ma'am
+
+# ignore AttributeErrors if they pop up with (--i).
+# get the local network ip
+$ ifconfig | py -x --i 're.search(r"192\.168[\d\.]+", x).group()'
+192.168.1.41